Improvement in beams for floors



w. w. LUMMUS.

Beams for Floors.

Paten ted June17. 1873.

IRON

IRON

Z@W Z Side.

'NVENT-OR- AM mom'umo GRAPHIC cu m: (osaonns Fnacsss.)

UNITED STATEs PATENT OEEIoE,

WILLIAM W. LUMMUS, 0F LYNN, MASSACHUSETTS.

IMPROVEMENT IN BEAMS FOR FLOORS.

Specification forming part of Letters Patent No. 139,903, dated June 17, 1873 application filed November 18, 1872.

To all whom it may concern:

Be it known that I, WILLIAM W. LUMMUS,

of Lynn, Essex county, in the State of Massa chusetts, have invented certain new and useful-Improvements in Beams, Floor-Joist, and Rafters; and I hereby declare the following to be a full and exact description thereof, reference being bad to the accompanying drawings forming part of this specification.

The nature or essence of my invention consists in a wooden beam having its vertica1 side's slightly hollowed or concave, and strengthened and protected by metal plates arched or curved to correspond with the sides of the beam, and connected by bolts or rivets through the beam.

In the accompanying drawings, Figure l is the elevation of the side of a beam with my improvements, and Fig. 2 is a cross-section of the same.

- In the above-mentioned drawings, A is a beam of wood with its vertical sides slightly hollowed or concave to fit the curvedor arched metal plates 13 B applied to its sides to strengthen and protect it, and prevent it from burning with the facility it would do if not protected by the iron. These iron plates B B may be connected or fastened together and to the beam'of wood by bolts or rivets O 0 passing through them and through the beam of wood.

The advantages of this invention are as follows, viz: Simplicity of construction and adaptation to service, economy in the use of iron, getting the greatest strength from a given thickness of iron with the least danger/ of bending, buckling, or collapsing, furnishing wood for nailingboards, laths, furrings, roofing, flooring or ceiling materials, which wooden nailing is protected from fire by the iron plates.

What I claim as my invention and improvement is- A Wooden beam having its vertical sides slightly hollowed or concave, and strengthened and protected by metal plates arched or curved to correspond with the sides of the beam, and connected by bolts or rivets through the beam, substantially as described.

WILLIAM W. LUMMUS.

Witnesses: I

J. DENNIs, J r., EDM. F. BROWN- 

